I am researching for some days now about which graphic card should I purchase. I am about to buy a new graphic card for my PC and I want one which is faster as well as quieter. I found many graphic cards but the best graphic cards that provided both, speed and less noise were only two; ATI Radeon HD 4850 and AMD Radeon HD 7750. Can anyone who has used these graphic cards tell me I should buy any of this? I would like to know which among these both is best.